Half to robert p



UNiT D STATES PAT NTOFFICE.

GEORGE CUTHBERT, OF' PHILADELPHlA, PENNSYLVANIA, ASSIGNOR OF ONE HALF TO ROBERT P. METZ, SAME PLACE.

PN EU MATIC CH UCK.

- SPECIFICATION forming part a Letters Patent No. 397,835, dated February 12, 1889. 1 Application filed June 28, 1888. Serial No. 278,412. (No model.)

To all whom, it may concern.- the exhaustion of the air Within the cup; but

Be it known that I, GEORGE C'UTHBERT, a I am not aware that it is common to con- 55 citizen of the United States, residing in the struct a device having an inner beveled edge,

city V and county of Philadelphia, State of so as to be adapted to hold or retain in place Pennsylvania, have invented a new and usean article having a disk or rounded surface ful Improvement in Pneumatic Chucks for without cutting the same, the said device he- Holding Work and Tools, which improvement ing provided with an air-exhaust, as de- 60 is fully set forth in the following specificascribed; neither is it believed to be old to ticn and accompanying drawing. mount said cup 'so as to be rotary, whereby My invention relates to improvements in the article thatis held maybe rotated; neither chucks; and it consists in constructing the is it thought to be old to constructa device of same as herein set forth and claimed. the character described wherein both the 65- The figure represents a longitudinal vercup and the exhaust pump or device with the tical section of a chuck embodying my inconnecting-tube are rotary.

r5 vention. x Having thus described my invention, what I Referring to the drawing, A represents at claim as new, and desire to secure by Letters cup, which in the present instance is of such Patent; is- 7o shape and size as to hold a watch-case which, 1. Apneumaticchuck consisting ofahollow is to be worked upon, the upper inner edges eup' having an inner beveled edge, a tube of the cup being rounded or beveled to oonleading from said cup, and an air-exhausting form to the contour of said case, and having device,'said parts combined substantially as a gasket, B, placed thereon, so as to form an described. 7 air-tight joint between the case and cup. 2'. A cup or socket and an air-exhausting Attached to and communicating with the pump connected therewith, the inner side of cup at the back thereof is a tube, 0, the same the upper edge of said cup being beveled being connected with a pump or pumping apand having a gasket thereon, said parts he paratus, D, whereby air may be exhausted ing combined substantially as described, from the cup. forming a pneumatic chuck for holding work It will be seen thatwhen the watch-caseor or tools, as stated.

0 other article is placed against the cup and 3. A pneumatic chuc. consistingof a cup the pumpD operated the air in the cup is exor socket with the inner side of its uppert hausted hack of the case, and thus the latter edge beveled or rounded, a tube connected is firmly held on the cup, so as to beworked with said cup, and a pumping device, said or acted upon as may be required in the art. tube being rotatable with said cup, said parts 5 When air is admitted into the cup, the work being combined substantially as described.

may be released, as is evident. 4. A pneumatic chuck consisting of stand- For holding tools the cup A is of size relaards, and a tube freely mounted on said standtively to the shank of the tool, and is more of ards and having a cup. or socket atone end the form of a socket than a cup. thereof and an air-exhaust device at the 40 'For work requiring rotationsof the cup the other end, both cup and air-exhaust device tube 0 is of the form of a mandrelmounted being rotatable with said tube, said parts beon standards E, and carries the pump D, ing combined substantially as described.

which may rotate with the mandrel or be made 5. A pneumatic chuck consisting of a tube stationary. Suitable packing or stufiing boxes with a cup at one end having inner beveled 45 may be provided, whereby the mandrel-andedges, a gasket resting on said edges, and an pump connection is properly air-tight. air-exhaust device at the other end of the The mandrel has a pulley, F, for an opertube, said parts being combined substan- I00 ating 'belt or band; but othelr poiwer-commutially asdescribed. nioatin means may be em oye 5 I am aware that it is not? new to employ a GEORGE CUTHBERT' cup or socket having a cutting-edge and pro- Witnesses: vided with an'inner raised platen or bed JOHN A. WIEDERSHEIM, against which an article to be out is held by A. P. JENNINGS. 

